A sideswipe with a semi often starts as a lane change, not as a turn. The truck moves over, or a car is traveling beside the trailer, and the two vehicles come together along the side. A blind spot may explain why the driver did not see the other vehicle. It does not, by itself, answer whether the lane change was made with safety. This page is about those crashes, statewide. It is not a wide-turn or squeeze page, and it is not the underride page.
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Blind-Spot and Sideswipe Truck Crashes in Oklahoma
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01
What this crash is
Large trucks have large areas beside, behind, and close in front of the cab where the driver may not see another vehicle in the mirrors. Those areas are sometimes called no-zones. A sideswipe can also become an underride if a car goes under the trailer; that hardware question belongs on the underride page.
02
The duty to change lanes safely, and the mirror rule
On a road with marked lanes, Oklahoma law says a vehicle “shall not be moved from the lane until the driver has first ascertained that the movement can be made with safety” (47 O.S. §11-309(2)). Before changing lanes, the driver must then give a signal of that intention for “not less than the last one hundred (100) feet traveled by the vehicle” (§11-309(2)). A related rule bars moving right or left on a roadway “unless and until such movement can be made with reasonable safety” (47 O.S. §11-604(A)). A blind spot may explain a miss. It does not remove those duties.
Federal rules require every bus, truck, and truck tractor to be equipped with two rear-vision mirrors, one at each side, “so located as to reflect to the driver a view of the highway to the rear, along both sides of the vehicle” (49 CFR 393.80(a)). Limited exceptions apply, such as trucks built so the driver can see to the rear through an interior mirror, which need only a driver-side outside mirror (49 CFR 393.80(b)). Questions after a crash include whether those mirrors were present, adjusted, and unbroken. Some trucks also have side cameras or warning sensors.
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The records that show the lane change
Dash-cam and side-cam video, engine data, signal data where it is recorded, lane-position marks, and damage along the sides of both vehicles can show who moved and when. Those records should be preserved promptly. See lost or overwritten records and a truck-crash investigation. If phone use or fatigue may be part of the story, those are separate questions; start with the fatigue page for hours issues, and do not treat this page as a rewrite of that one.
Related reading: the truck accident hub, immediate steps after a crash, and the state truck-crash law guide.
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Jason Hicks is an Oklahoma truck-wreck trial lawyer.
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